Elbow coupling



FIG. 1 is a perspective view of a first embodiment of our design for an elbow coupling;

FIG. 2 is a top view of the elbow coupling shown in FIG. 1;

FIG. 3 is a bottom view of the elbow coupling shown in FIG. 1;

FIG. 4 is a left side view of the elbow coupling shown in FIG. 1, the right side being shown in perspective in FIG. 1;

FIG. 5 is a front view of the elbow coupling shown in FIG. 1;

FIG. 6 is a rear view of the elbow coupling shown in FIG. 1;

FIG. 7 is a perspective view of a second embodiment of our design for an elbow coupling;

FIG. 8 is a top view of the elbow coupling shown in FIG. 7;

FIG. 9 is a bottom view of the elbow coupling shown in FIG. 7;

FIG. 10 is a left side view of the elbow coupling shown in FIG. 7, the right side being shown in perspective in FIG. 7;

FIG. 11 is a front view of the elbow coupling shown in FIG. 7; and,

FIG. 12 is a rear view of the elbow coupling shown in FIG. 7.

The broken lines shown in the various Figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an elbow coupling, as shown and described. 